Can heeding the automatic impulse to trust one's romantic partner increase physical and psychological resilience in the face of doubts about a partner's responsiveness? Experimental participants were led to believe that their partner perceived a long list of faults in them. All participants then gave a speech about their future career goals while their partner watched. The results revealed impulsive trust (i.e., evaluative associations to the partner on the Implicit Associations Test) increased resilience to partner-criticism for people who heed their automatic impulses (i.e., low in working memory capacity). Specifically, for people low in working memory capacity and high in impulsive trust, partner-criticism increased resilience relative to control participants (i.e., expecting a more approving partner reaction to their speech, cardiovascular reactivity consistent with a positive challenge response). In contrast, for people low in working memory capacity and low in impulsive trust, partner-criticism decreased resilience relative to control participants (i.e., expecting a more disapproving partner reaction, cardiovascular reactivity consistent with a negative threat response).